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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26be518d0a7a797b79b6a3c8739eb3404c1139f98290aa231a26ae01f616c223' 
  AND token = 'XzovdqTymIbrxoWt6TXKQyu610OLsPHIqkv/MifsSIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}